Tag Info

(ZIP+4 or ZIP plus 4) Extension of the United States postal code providing four extra digits for additional location specificity.

A ZIP+4 code uses the basic five-digit code plus four additional
digits to identify a geographic segment within the five-digit delivery
area, such as a city block, a group of apartments, an individual
high-volume receiver of mail or any other unit that could use an extra
identifier to aid in efficient mail sorting and delivery.